Improvement in lathe for turning ovals



lnted Otatn RAMSEY LAWSON, 0F SHELBURNE FALLS. MASSACHUSETTS.

lLetters Patent No. 97,096, dated Norcmber'23, 1869.

Maw-

k IMPROVEMENT IN LATHE FOR TURNIG OVALS.

The Schedule referred to in these Letten Patent and making part of the lame.

To all whom it may concern:

Be it known that I, RAMsEY Lawsox, of Shelburne Falls, in the county oi' Franklin, and State of Massachusetts, have invented a new and improved Lathe-Attachment for Turning Ovals; and I do hereby declare that the following is a full, clear, and exact description thereoi, which will enable others skilled in the :ut to make and use the same, reference being had to the accompanying drawing, forming partici' this specitieation, in which- Figure 1 is a fac-e view of my improved device, part oi' the sliding plate being broken away to show the construction.

Figure 2 isa detail sectional view ofthe same, taken through the line I fr, iig. 1.

Similar letters oi' reference indicate corresponding parts. v

\I \"invention has for its object,.to furnish an improved device for attachment to lathes, by means ot' which oval handles i'or tools and other oval work may be turned with the same ease and rapidity as round work; and

I t-veonsists in the construction andoomhination of the various parts of the device, as hereinafter more fully described.

A is the centre, which is so formed as to take hold of the material to he turned, in such a. way that the said material to be turned may carry the said centre with 'it in its revolution.

The centre A passes through a hole in the plate B, and has an oval plate, C, formed solidly upon or rigidly attached to its inner end, as shown in figs. 1 and 2.

The oval plate C revolvesin a circular reeessf'orined in the inner side of the plate B, for its reception, so that the said plate B may lie smoothly upon the surface of the plate D, in a dovetaled groove in the face 0f which, the said plate B works.

E is a pin rigidly attached to the plate D, in such a position as to enter the recess in the inner side of the plate B, so that the edge of the oval plate C may bear against it.

The plate B is drawn forward to holdthe oval plate C closely against the pin E, by a rubber or equivalent spring, F, attached tothe said plates B and D.

By this construction, as the centre is revolved by the material to be turned, the edge ot' the oval plate G, pressing against the pin E, causes the said centre, and with it the plate B, to more back and forth upon the piate D, the length of said movement depending upon the relativelengths oi' the longer and shorter axes of the oval-plate C.

'lo turn ovals of dilierent forms, different centres A, and diiiereut oval plates C, must he used.

To enable the plate B to be removed for the convenient changingr of. the said centres and oval plates, the under side ot' thev plate B is grooved from therecess in which the oval plate G revolves, to its outer edge, toward thevspring 1 i'or the passage oi' the pin E, so' that when the spring l" is disconnected from the plate B, the. said plate may he easlyslid out :md removed from the plate D. By this construction, the part of the material nearest to the centre A, will be most oval, and the part oi' the material turned near the other centre ot' the lathe will be very nearly eir cular. Y

To turn the material to the same oval throughout its entire length, a'similar attachment must be connected with the vother centre of the lathe, in suclba way that both ends ofthe said material may have the same backwardaudforward movement while being revolved.

Having thus described my invention,

lVhat I claim as new, and desire to secure hy Lctters Patent, is-

Au improved attachment for lathes, formed by the combination of the cintre A, recessed and grooved sliding plate B. ovalplate C, grooved plate D, piu'E, and rubber or equivalent spring F, with each other, substantially as herein shown and described, and for the purpose set-forth.

RAMSEY LAWSON.

Witnesses A Braun MAXWELL, WILLIS L. Buows. 

